Die-casting machine



1. c. KOPF.

' DIE CASTING MACHINE.

APPLICATION FILED OCT. 14. 1920.

1,394,561 Patented Oct. 25, 1921.

5 SHEETS-SHEET I.

f igj.

INVENT R 0. 74/

I ATTORNEY l. C. KOPF.

DIE CASTING MACHINE.

APPLICATION man OCT. 14, 1920.

1,394,561, Patented Oct. 25, 1921.

5 SHEETS-SHEET 2.

L I I 20 Y- x i J. C. KOPF.

DIE CASTING MACHINE- APPLICATION FILED on. 14. 1920.

Patented Oct. 25, 1921.

5 SHEETS-SHEET 3.

J. C. KOPF.

DIE CASTING MACHINE.

APPLICATION FILED 001. I4, 1920.

1,394,561, Patented Oct. 25, 1921.

5 SHEETS-SHEET 4.

ARA/Y I I. c. KOPF.

DIE CASTING MACHINE.

7 APPLICATION FILED OCT. I4, I920. 1,394,561, Patented Oct. 25, 19 21,

5 SHEETS-SHEET 5.

1 ATTORNEY JOHN C. KOPF, OF BELLEVUE BOROUGH, PENNSYLVANIA.

mn-cns'rme MACHINE.

Specification of Letters Patent.

Application filed 0ctober'1 4, 1920. Serial No. 416,876.

.T 0 all whom it may concern:

Be it known that I, JoHN' C. KOPI: a citizen of the United States, and aresident of the borough of Bellevue, in the county'of Allegheny andState of Pennsylvania, haveinvented a new and useful Die-CastingMachine,of which the following is a specification.

The object of the invention is to provide an efiicient machine fordie-casting. To this end the invention may be said to (30115181? in theparts, improvements and combinations,

hereinafter described and more particularly pointed out in the claims.

In the accompanying drawings, forming part hereof:

Figure 1 is a central vertical side sectional elevation through themachine and cup containing the charge of molten metal, parts being shownin the early part of the downward stroke with the receptacle sustainedsomewhat above the die 'and noattempt being made to represent the diecavities; Fig. 2 is a similar view on a larger scale omitting the upperportion of the machine, showing the receptacle forced down tight uponthe die and the metal in the act of being expelled from the receptacle;Fig. 3 is a front elevation showing the plunger slightly above thereceptacle and the latter seated upon the die, and illustrating thecatch for the two-part receptacle in locking position in full lines andin unlocked position in dotted lines; Fig. 4

is a horizontal section, taken directly above the receptacle; Figs. 5and 7 are plan views of the rear and front halves of the receptacle,respectively; and Figs. 6 and 8 are elevations of the same.

The machine has a frame 1 including a table portion 2 and a rearstandard portion 3 rising above the table. The table supports the die 4,the form of which will vary according to the articles to be cast, andwhich in the illustrated instance may be understood to contain cavitiesfor casting two arti: cles simultaneously. The die has a handle 5 uponits front and can be drawn forward and pushed back along a, key 6 in thetable engaging a notch in the bottom of the die. Its working position isdetermined by an adjustable screw 7 which is held in the rear portion ofthe frame and abuts the back of the die.

On the upper end of the standard 3 is a 7 power cylinder 8,, containinga piston 9. By

table.

10 and not requiring particular explanation, pressure fluid is admittedand exhausted alternately at opposite sides of the piston to force itdownward and upward.

The piston rod 11 extends downward through a stuffin -box 12 in thebottom of the cylinder, an on its lower end is the plunger 13 adapted toenter the cylindrical cavity 14 of a receptacle 15. This receptaclePatented (Oct. 25, 1921.

mally sustained somewhat above the die, and

whereby it is automatically forced down tight upon the die when theplunger descends, and tends to rise automatically when the plungerascends. In the particular construction illustrated the ends of thereceptacle are connected to a pair, of vertical rods 18 which passdownward, vertically guided, through openings in the frame, and areconnected beneath the table by a cross-bar 19 resting on adjustment nuts20. Encircling the upper portions of these rods, between the top of thetable and the receptacle, are springs 21, adapted to lift arid sustainthe receptacle a distance above the die and break the sprue. The upwardmovement of the receptacle under the action of these springs is limitedby" the contact of the bar with the under part of the table, and" needbe slight.

' A two-armed lever 22 fulcrumed at 23 on the standard 3 has a forkedslotted end 24 which engagesa pin 25 on the plunger or piston rod, whileto its other end is plvoted a rod 26 extending downward below the On thelower part of this rod, supported onan adjustable screw abutment 27, 1sa depressing spring 28. A second twoarmed lever 29 fulcrumed at 30beneath the table carries a roller 31 at its forward end to bear uponthe top of the cross-bar 19, and at its rear end is bifurcated toreceive the pressure of the depressing spring through a Ca i 32 thereon.I

he back half 15 of the receptacle is provided on its front, at oppositeends, with pairs of vertically spaced lugs 33 and 33 to receive theupper portions of the rods 18, the ends of which are screw-threaded toengage internal threads in the top lugs. The back half is thus heldagainst swinging movement. The front half 15 has a rear hinge lug 34 atone end, with a circular hole whereby it pivots on one of the rods,between the lugs 33 of the back half. At the opposite end the rear faceof the front half has a portion 35, which fits between the lugs 33 and,

which has a notch 36 on its rear face to clear the portion of the rodbetween. said lugs. The catch 16 comprises an arm, bearing the samenumeral in the drawings, pivoted at 37 upon a pin on the front of thepart 15 of the receptacle, with its major portion offset forwardly toconstitute a handle, and a nose 38 adapted for cam engagement with thenotch or hook 39 of a keeper bar 40 screwed to the end face of the rearpart 15*.

It will thus be seen that when the piston and plunger are up, thereceptacle is sustained somewhat above the die. The charge of moltenmetal. is introduced into the receptacle atthis time, being retained byan asbestos cup 41, which will presently be described; and the powercylinder is then operated to cause the plunger to descend.

The parts are so proportioned and adjusted that, before the plungercommences to act upon the metal, the rocking of the lever 22 by thepiston rod, pulling up on the rod 26,

- shorter springs applies pressure through the spring 28 to the lever29, so as to cause the latter to draw the receptacle down tight upon thedie, against the action of the lifting springs 21. After the receptaclehas become seated the depressing spring 28 yields as a cushion duringfurther downward movement of the plunger. The metal having been driveninto the die cavities, the cylinder is operated to cause the plunger totravel upward. B

reversal of the operation of the linkage which has been described, thisrelieves the pressure upon the spring 28, and permits the springs 21 toact upward on the receptacle. These springs are of substantial strength,and their pressure is or may be sufficient to break the sprue. If thesprue is too heavy to be broken in this way, the front of the receptacleis opened, and the die is drawn forward from beneath the receptaclecarrying the sprue and heel of the charge with it, after which the sprueis broken with a chisel. When thus withdrawing the die the springs easeup on the receptacle sufficiently to enable the die to be pulled forwardeasily. When the die is out, the springs hold the receptacle up so thatthe same or a fresh die can be re-introduced conveniently. By varyingthe adjustment of the nuts 20 and substituting longer or 21, dies ofdifferent heights can be accommodated.

It will be understood that other forms of interconnections between theplunger means and the movable receptacle may be em ployed, and thatnumerous other changes In. 1y be made without departing from essentia s.

The asbestos cup 41 referred to lines the sides and bottom of the cavityof the receptacle, and serves as a temporary retainer for the moltenmetal. When ressure is applied by the plunger, it is col apsed andruptured and the metal is forced out through the gate 16. As the plungermoves downward in the die the lining performs the important function ofacting as a acking. It is preferably a complete pre-f drmed cup,

though in some instances an asbestos disk plunger into the die, verticalguides and lifting springs for the receptacle, and means whereby descentof the plunger overcomes said springs and causes the receptacle to seaton the die.

3. A die-casting machine, comprising a frame, a plunger, and, means foroperating the same, in combina on with a receptacle from which the metalis forced by the plunger into the die, vertical guides and liftingsprings for the receptacle, and conn-errions including a depressingspring whereby descent of the plunger overcomes the lifting springs andcauses the receptacle to seat on the die.

4. In a die-casting machine, the combination of a frame, a plunger, areceptacle from which the metal is forced by the plunger into the die,rods connected to the receptacle and passing downward in guided relationin the frame, springs tending to lift the receptacle, and connectionsbetween the plunger and said rods, whereby the receptacle is forceddownward against its lifting springs when the plunger descends andpermitted to rise when the plunger ascends.

5. In a die-casting machine, the combination of a frame, a plunger, areceptacle from which the metal is forced by the plunger into the die,rods connected to the receptacle and passing downward in guided relationin the frame, springs tending to lift the receptacle, a lever connectedwith the plunger, a rod connected to said lever, a depressing spring onsaid rod, and a lever arranged to be acted upon by said depressingspring to depress the receptacle rods.

6. In a die-casting machine, the'combination of a frame, a plunger, areceptacle from which the metal is forced by the plunger into the die,rods connected to the receptacle and passing downward in guided relationin the frame, springs tending 'to lift the receptac1e,.a cross-bar onthe lower part of said rods, a lever connected with the plunger, a-rodconnected to said lever, a depressing spring on said rod, and a leverarranged to be acted on by said depressin spring and having a roller tobear on said cross-bar.

7. In a die-casting machine, the combination of a frame, a plunger, avertically movable receptacle from which the metal is forced by theplunger into the die, and means comprising springs for lifting" and'depressing and linkage connected with the plunger whereby the receptacleis depressed I when. the plunger descends and rises when the plunger isup.

8. In a die-casting machine, the combination with a die, a receptacleand a plunger, of means for automatically lifting the receptacle tobreakthe sprue when the plunger rises.

9. In a die-casting machine, the combination with a'plunger and meansfor operating the same, of a;vertically guided recep-- tacle from whichthe metal is forced by the plunger into the die, said receptacle beingconstructed so as to be opened-and closed,

and spring means and linkage operated by the plun er for urging upwardand sustaining t e receptacle and for forcing itthe die when the plungerdown tight upon descends.

10. In a die-casting machine, having a die, a plunger, and means-foroperatingtth'e same: a split receptacle from which the; metal, is forcedby the plunger into the die,

means for vertically guidingpne-half of the receptacle,'the other halfbelng hinged and having a catch forlocking ,it closed, and

' means for lifting and means for depressing die, a plunger; [and meansfor operating the receptacle; P

11. In a. die-casting machine, having a the samez a split receptaclefrqm whi'ch the I metal is forcedb the plunge'r'into'the die,

vertrcal guide ro s 'ponnecte at their upper .ends to one-half of thereceptacle, the other half of the receptaclebeing hinged on one of saidrods and having a latch for locking it i closed, springs encirclingsaidrods to lift the receptacle, and means for depressing the re-.ceptacl upon thedi'ej when the? plunger deiscends. l

12. In a'di e-casting machin are conhbina tion with a plunger and areceptacle from which the metal is forced by the plunger into the die,of means whereby the receptacle is automatically depressed upon the diewhen the plungerdescends and urged 'up-. ward when the plunger rises.

13. In a die-casting machine, the combination with a plunger and areceptacle from which the metal is forced by .the

plunger into the die, of linkage operated by the "plungevand springmeans, whereby the a receptacle is automatically depressed when theplunger descends and urged upward when the plunger rises.

14. In a die-casting machine, a supporting frame, a die,.a plunger, anda vertically movable guided receptacle, from which the plunger forcesthe metal into the die.

15. Im a die-casting machine, a supporting frame, a die, a plunger, avertically mov- I able receptacle from which the plunger forces themetal into the die, and means for raising said receptacle from the dieto break the sprue. I

16. In a die-casting machine, a supporting frame, a die, a plunger, avertically movable receptacle from which the plunger forces the metalinto the die, and means for raising and lowering the receptacle.

'17. In a die-casting machine, a supporting frame, a,die, a plunger, "a,vertically movrable receptacle from which the plunger forces the metalinto the die, and a fluidpressure cylinder operatively connected withsaid receptacle.

" 18. In adie-casting machine, having a diet and plunger, a verticallymovable re ceptacle from which the metal isforced by the plungerinto thedie, and means for lifting the receptacle to break the for seating thesame again upon 19. In a die-casting machine, a table, a die thereon, aplunger, a vertically movable re: 'c'eptacle between the die' andplunger, and guide rods for the receptacle passing down- Wigid atopposite sides of the die below the t3, e. i

20. In a die-casting machine, a table, a

die lthereon, a plunger, a vertically movable receptacle between thedieand plunger,

rue and :iie die.

